vlib/v/checker/tests/return_aliases_of_fixed_array.vv:8:18: error: fixed array cannot be returned by function using alias
    6 | }
    7 |
    8 | fn (v Mat) foo() Mat {
      |                  ~~~
    9 |     return v
   10 | }
vlib/v/checker/tests/return_aliases_of_fixed_array.vv:12:10: error: fixed array cannot be returned by function using alias
   10 | }
   11 |
   12 | fn bar() Mat {
      |          ~~~
   13 |     return Mat([[1, 2]!, [3, 4]!]!)
   14 | }
